I studied karate for a few years and early on I learned about Tiger Balm, a salve that is good for soothing aching muscles while you get in shape. It comes in different strengths. I bought the red one. (strongest). One of the exercises we spent time on was full front and side leg splits. Needless to say your groins get a bit sore. A word of advice: don't come home from karate class, spread Tiger Balm on your groins, and go to bed. You will be awoken before too long.